James -geangee



(ini'trh vtars datent @frn JAMES GRANGER, OF ZANESVILLE,v OHIO.

Leners Paraninfo. 64,309, dated Apt-iz 30, 1867.

BOAT-BUILDERS PLATFORM.

TO ALL WHOM IT MAY CONCERN i Be it known that I, JAMES GRANGER, of Zanesville, in the county of Muskingum, and State of. Ohio, have invented a new and useful improvement in Boat-Builders Platform and I do hereby declare that the following is a full, clear, and exact description thereof, which will'enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this speciiication, in which- Figure 1 is a top or plan view of my improved platform.

Figure Qis a vertical cross-section of the same, taken through the linex .19', iig. l, and showing in red lines a boat in position upon it. v 'A Figure 3 is the same view as iig. 2, showing the` platform inclined` for launching the; heat, and the boat launched.

Similar letters of reference indicate like parts.

My invention has for its object to furnish an improved platform, by means of which ii'atboats and other vessels may be conveniently built bottom upwards, and from which they may be easily launched.. And it consists of an improved platform, formed by the combination o f cross-beams, longitudinal timbers', strengthening pieces and posts, with each other, in the manner hereinafter more fully described; y y v A are the posts upon whichothe platform rests, and which extend about three and a half: feet; above the A ground when the ground has a sufficient inclination from the water. But when the ground is level, the proper' inclination may be obtained by building an articial foundation for the platform, asl represented inV the drawings', or by lengthening the posts A, and strengthening'them accordingly. The dimensions given in this description are merely suggested proportional dimensions, the actual4 size of the platform depending upon 'the character of.l the vessels for building which Vthe platform is intended to be used. Upon the tops of the posts Aare formed tenons, the tops of which are rounded olf, and their-shoulders inclined, so as to allow the platform to be tipped. intothe position shown in iig. 3, for convenience in launching the vessel. The cross-timbers B are about twenty four feet long, and are strengthened in their main bearings by pieces of Wood D, which are about six feet inl'y length, and of the same width as the cross-timbers B, t'o` the under side of which they are attached. In or; through these pieces D are made mortises, into which fit the tenons formed upon the upper ends of the posts A2 upon which the crosstimbers rest, as before described. The posts A and cross-timbers B should be plaee'd about eight feet apart. E is a round timber, securely attached to the ends ofthe eros`s-timbers B, that rest upon the ground when the platform is in a horizon-tal position. F are longitudinal timbers, attached to the under sides of the cross-timhers B, to connect and strengthenthem. These timbers F are placed beneath the timbers B, to be out ofthe Way when launching the vessel. The platform may be secured in :iy horizontal positien while building the vessel, in any convenient manner.

l The vessel is launched by tipping thc platform-into the position shown in iig; 3, and allowing the vessel to slide down the timbers B, its descent being regulated by ropesattachcd to the side-timbers of" the boat on theside towards the water. These ropes then pass under the boat, and pass around the round timber E. Upon reaching'the Water the vessel may he turned over by the ordinary means in the hands of every llatboat builder. The side of the boat that sustains theavcight while being turned over should be strengthened for the occasion with additional braces.

I claim as new, and desire to secure by Letters Patent- I. Pivoting the tilting platform to the* post A, so that, when the platform is tilted, the entire weight of the platform and. the boat will rest upon thefoundation, or directly upon the ground, substantially as described, for the purpose specified. Y v

2. The post A', with its inclined shoulders, to which the platform B' is pivoted, at a distance nearer to its inner end than at its cutciso that,-\vhcn the platform is lowered, the Weight is upon the ground or the foundation, in the manner as and for the purpose specified.

' JAMES GRANGER.

Witnesses: I

SAMUEL CHAPMAK, JOHN QUiGLnr. 

